Fix proto forwarded header to industry standard

Author: Jamie Curnow

rootfs/etc/nginx/conf.d/include/proxy.conf

@@ -1,6 +1,6 @@
 add_header       X-Served-By $host;
 proxy_set_header Host $host;
 proxy_set_header X-Forwarded-Scheme $scheme;
-proxy_set_header X-Forwarded-Protocol $scheme;
-proxy_set_header X-Forwarded-For $remote_addr;
+proxy_set_header X-Forwarded-Proto  $scheme;
+proxy_set_header X-Forwarded-For    $remote_addr;
 proxy_pass       http://$server:$port;